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Summary of Significant Accounting Policies and Concentrations of Risk (Concentrations) (Details) - Customer
12 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Mar. 31, 2018
Concentration Risk [Line Items]      
Percentage of total accounts receivable accounted from Avnet 31.00% 37.00%  
Percentage of net revenues through resale of product from Avnet 42.00% 45.00% 43.00%
Number of end customers accounted for net revenues 0    
Minimum [Member]      
Concentration Risk [Line Items]      
Percentage of higher grade securities investment in debt securities (more than) 94.00%    
Sales Revenue, Goods, Net [Member] (Deprecated 2019-01-31) | Support Products [Member] | Maximum [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 1.00%